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Sprout/sprout/tuple/flex.hpp
bolero-MURAKAMI ea06f92565 add has_sprout_get metafunction, update copyright
2019-01-07 17:47:17 +09:00

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/*=============================================================================
Copyright (c) 2011-2019 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_TUPLE_FLEX_HPP
#define SPROUT_TUPLE_FLEX_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/index_tuple/metafunction.hpp>
#include <sprout/tuple/tuple/tuple.hpp>
#include <sprout/tuple/tuple/get.hpp>
#include <sprout/tuple/tuple/tuple_size.hpp>
#include <sprout/tuple/tuple/tuple_element.hpp>
#include <sprout/tuple/tuple/type_traits.hpp>
#include <sprout/tuple/flexibly_construct.hpp>
#include <sprout/tuple/indexes.hpp>
#include <sprout/utility/value_holder/value_holder.hpp>
#include <sprout/type_traits/identity.hpp>
#include <sprout/type_traits/common_decay.hpp>
namespace sprout {
namespace tuples {
//
// flex_tuple
//
template<typename... Types>
class flex_tuple {
public:
typedef sprout::tuples::tuple<Types...> tuple_type;
private:
typedef sprout::value_holder<tuple_type const&> holder_type;
private:
holder_type holder_;
public:
flex_tuple(flex_tuple const&) = default;
flex_tuple(flex_tuple&&) = default;
SPROUT_CONSTEXPR flex_tuple(tuple_type const& t)
: holder_(t)
{}
SPROUT_CONSTEXPR operator tuple_type const&() const {
return holder_.get();
}
template<typename... UTypes>
SPROUT_CONSTEXPR operator sprout::tuples::tuple<UTypes...>() const {
return sprout::tuples::tuple<UTypes...>(sprout::tuples::flexibly_construct, holder_.get());
}
};
//
// flex
//
template<typename T>
inline SPROUT_CONSTEXPR T const&
flex(T const& t) {
return t;
}
template<typename... Types>
inline SPROUT_CONSTEXPR sprout::tuples::flex_tuple<Types...>
flex(sprout::tuples::tuple<Types...> const& t) {
return sprout::tuples::flex_tuple<Types...>(t);
}
template<typename To, typename... Types>
inline SPROUT_CONSTEXPR To
flex(sprout::tuples::tuple<Types...> const& t) {
return sprout::tuples::flex(t);
}
//
// recursive_flex_tuple
//
template<typename... Types>
class recursive_flex_tuple
: public sprout::tuples::flex_tuple<Types...>
{
private:
typedef sprout::tuples::flex_tuple<Types...> base_type;
private:
template<typename... UTypes, sprout::index_t... Indexes>
static SPROUT_CONSTEXPR sprout::tuples::tuple<UTypes...>
implicit_conversion_impl(typename base_type::tuple_type const& t, sprout::index_tuple<Indexes...>) {
return sprout::tuples::tuple<UTypes...>(
sprout::tuples::flexibly_construct,
sprout::tuples::flex(sprout::tuples::get<Indexes>(t))...
);
}
public:
recursive_flex_tuple(recursive_flex_tuple const&) = default;
recursive_flex_tuple(recursive_flex_tuple&&) = default;
SPROUT_CONSTEXPR recursive_flex_tuple(typename base_type::tuple_type const& t)
: base_type(t)
{}
template<typename... UTypes>
SPROUT_CONSTEXPR operator sprout::tuples::tuple<UTypes...>() const {
return implicit_conversion_impl<UTypes...>(*this, sprout::make_index_tuple<sizeof...(Types)>::make());
}
};
//
// recursive_flex
//
template<typename T>
inline SPROUT_CONSTEXPR T const&
recursive_flex(T const& t) {
return t;
}
template<typename... Types>
inline SPROUT_CONSTEXPR sprout::tuples::recursive_flex_tuple<Types...>
recursive_flex(sprout::tuples::tuple<Types...> const& t) {
return sprout::tuples::recursive_flex_tuple<Types...>(t);
}
template<typename To, typename... Types>
inline SPROUT_CONSTEXPR To
recursive_flex(sprout::tuples::tuple<Types...> const& t) {
return sprout::tuples::recursive_flex(t);
}
//
// common_flex_type
//
template<typename... Types>
struct common_flex_type;
template<typename T>
struct common_flex_type<T>
: public sprout::common_decay<T>
{};
namespace detail {
template<typename T, typename U, typename IndexTuple>
struct common_flex_type_impl_2;
template<typename T, typename U, sprout::index_t... Indexes>
struct common_flex_type_impl_2<T, U, sprout::index_tuple<Indexes...> >
: public sprout::identity<
sprout::tuples::tuple<
typename sprout::tuples::common_flex_type<
typename sprout::tuples::tuple_element<Indexes, T>::type,
typename sprout::tuples::tuple_element<Indexes, U>::type
>::type...
>
>
{};
template<typename T, typename U, typename Enable = void>
struct common_flex_type_impl_1;
template<typename T, typename U>
struct common_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value < sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::common_flex_type<U>
{};
template<typename T, typename U>
struct common_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value > sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::common_flex_type<T>
{};
template<typename T, typename U>
struct common_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value == sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::detail::common_flex_type_impl_2<T, U, typename sprout::tuples::tuple_indexes<T>::type>
{};
template<typename T, typename U, typename Enable = void>
struct common_flex_type_impl;
template<typename T, typename U>
struct common_flex_type_impl<T, U, typename std::enable_if<(sprout::tuples::is_tuple<T>::value && sprout::tuples::is_tuple<U>::value)>::type>
: public sprout::tuples::detail::common_flex_type_impl_1<T, U>
{};
template<typename T, typename U>
struct common_flex_type_impl<T, U, typename std::enable_if<!(sprout::tuples::is_tuple<T>::value && sprout::tuples::is_tuple<U>::value)>::type>
: public sprout::common_decay<T, U>
{};
} // namespace detail
template<typename T, typename U>
struct common_flex_type<T, U>
: public sprout::tuples::detail::common_flex_type_impl<T, U>
{};
template<typename T, typename U, typename... Tail>
struct common_flex_type<T, U, Tail...>
: public sprout::tuples::common_flex_type<typename sprout::tuples::common_flex_type<T, U>::type, Tail...>
{};
//
// common_recursive_flex_type
//
template<typename... Types>
struct common_recursive_flex_type;
template<typename T>
struct common_recursive_flex_type<T>
: public sprout::tuples::common_flex_type<T>
{};
namespace detail {
template<typename T, typename U, typename IndexTuple>
struct common_recursive_flex_type_impl_2;
template<typename T, typename U, sprout::index_t... Indexes>
struct common_recursive_flex_type_impl_2<T, U, sprout::index_tuple<Indexes...> >
: public sprout::identity<
sprout::tuples::tuple<
typename sprout::tuples::common_recursive_flex_type<
typename sprout::tuples::tuple_element<Indexes, T>::type,
typename sprout::tuples::tuple_element<Indexes, U>::type
>::type...
>
>
{};
template<typename T, typename U, typename Enable = void>
struct common_recursive_flex_type_impl_1;
template<typename T, typename U>
struct common_recursive_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value < sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::common_recursive_flex_type<U>
{};
template<typename T, typename U>
struct common_recursive_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value > sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::common_recursive_flex_type<T>
{};
template<typename T, typename U>
struct common_recursive_flex_type_impl_1<T, U, typename std::enable_if<(sprout::tuples::tuple_size<T>::value == sprout::tuples::tuple_size<U>::value)>::type>
: public sprout::tuples::detail::common_recursive_flex_type_impl_2<T, U, typename sprout::tuples::tuple_indexes<T>::type>
{};
template<typename T, typename U, typename Enable = void>
struct common_recursive_flex_type_impl;
template<typename T, typename U>
struct common_recursive_flex_type_impl<T, U, typename std::enable_if<(sprout::tuples::is_tuple<T>::value && sprout::tuples::is_tuple<U>::value)>::type>
: public sprout::tuples::detail::common_recursive_flex_type_impl_1<T, U>
{};
template<typename T, typename U>
struct common_recursive_flex_type_impl<T, U, typename std::enable_if<!(sprout::tuples::is_tuple<T>::value && sprout::tuples::is_tuple<U>::value)>::type>
: public sprout::tuples::common_flex_type<T, U>
{};
} // namespace detail
template<typename T, typename U>
struct common_recursive_flex_type<T, U>
: public sprout::tuples::detail::common_recursive_flex_type_impl<T, U>
{};
template<typename T, typename U, typename... Tail>
struct common_recursive_flex_type<T, U, Tail...>
: public sprout::tuples::common_recursive_flex_type<typename sprout::tuples::common_recursive_flex_type<T, U>::type, Tail...>
{};
} // namespace tuples
using sprout::tuples::flex_tuple;
using sprout::tuples::flex;
using sprout::tuples::recursive_flex_tuple;
using sprout::tuples::recursive_flex;
using sprout::tuples::common_flex_type;
using sprout::tuples::common_recursive_flex_type;
} // namespace sprout
#endif // #ifndef SPROUT_TUPLE_FLEX_HPP
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